This article presents a theoretical model of lesson study's impact on instruction, through intervening impact on teachers' knowledge, beliefs and dispositions, teachers' learning community, and curriculum. It also describes four different types of lesson study in Japan, pointing out their synergies in producing a system where local teachers…

Lesson study requires teachers to discuss the essential concepts that the students need to learn, compare the concepts with curriculums and consider the present knowledge of students. The various examples and experiences of teachers performing lesson study are presented.